PROBLEM TO BE SOLVED: To provide a harmful organism control agent which in particular has a superior insecticidal and/or acaricidal activity, superior safety, and can be advantageously and industrially synthesized.SOLUTION: There is provided a diaryl imidazole compound represented by formula (I) or salt thereof, wherein A1 and A2 represent N or the like； B1, B2, B3 and B4 represent C, N or the like； X1 represents an unsubstituted/substituted C1-6 alkyl group or the like； n represents a number of X1 and represents an integer of 0 to 4； R1 represents an unsubstituted C1-6 alkyl sulfonyl group； R2 represents an unsubstituted C1-6 alkyl group； m represents a number of the oxide group bonding with any one of the two nitrogen atoms which does not bond with R2 on the imidazole ring, and represents an integer of 0 or 1； R3 represents H； and Ar represents an unsubstituted/substituted 5 membered heteroaryl group or the like.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】特に殺虫活性及び／又は殺ダニ活性に優れ、安全性に優れ、かつ工業的に有利に合成できる有害生物防除剤の提供。【解決手段】式（I）で表されるジアリールイミダゾール化合物又はその塩。（式中、Ａ１及びＡ２は、Ｎ等；Ｂ1、Ｂ2、Ｂ３及びＢ４は、Ｃ又はＮ等；Ｘ1は、置換/非置換のＣ１～６アルキル基等；ｎは、Ｘ1の個数を示しかつ０～４の整数；Ｒ1は、無置換のＣ１～６アルキルスルホニル基；Ｒ2は、無置換のＣ１～６アルキル基；ｍは、イミダゾール環上の二つの窒素原子のうちＲ2が結合していない方の窒素原子に結合するオキシド基の個数を示しかつ０または１の整数；Ｒ3は、Ｈ；Ａｒは、置換/非置換の５員ヘテロアリール基等を表す）【選択図】なし
